| Achnantheiopsis Lange-Bert., 1997 |
| Achnantheiopsis dubia (Bréb.) Lange-Bert., 1997 |
| Achnantheiopsis frequentissima (Lange-Bert.) Lange-Bert., 1997 |
| Achnantheiopsis lanceolata (Bréb.) Lange-Bert., 1997 |
| Achnanthidiaceae D.G. Mann, 1990 |
| Achnanthidium Kütz., 1844 |
| Achnanthidium affine (Grunow) Czarn., 1994 |
| Achnanthidium biasolettianum (Grunow) Round & Bukhtiyarova, 1996 |
| Achnanthidium catenatum (Bily & Marvan) Lange-Bert., 1999 |
| Achnanthidium coarctatum Bréb. ex W. Sm., 1855 |
| Achnanthidium eutrophilum (Lange-Bert.) Lange-Bert., 1999 |
| Achnanthidium exiguum (Grunow) Czarn., 1994 |
| Achnanthidium exile (Kütz.) Heib., 1863 |
| Achnanthidium helveticum (Hust.) Monnier, Lange-Bert. & Ector, 2007 |
| Achnanthidium lanceolatum Bréb., 1846 |
| Achnanthidium lineare W. Sm., 1855 |
| Achnanthidium minutissimum (Kütz.) Czarn. 1994 |
| Achnanthidium minutissimum var. jackii (Rabenh.) Lange-Bert. , 1989 |
| Achnanthidium neomicrocephalum Lange-Bert. & F.Staab, 2004 |
| Achnanthidium nodosum (Cleve) Tseplik & Chudaev, 2020 |